Some projects are too big for one trade — an addition, a whole-floor renovation, a garage conversion, a house that needs three things fixed in the right order. That is when you want a general contractor holding the schedule, the subs, and the permit. Describe the project and licensed Hillsboro GCs will respond.
Not carpentry — coordination. The value is in sequencing framing, mechanical, electrical, plumbing, insulation, drywall, and finish so nobody shows up to a site that is not ready, and in carrying responsibility when something goes wrong. On a single-trade job that overhead is waste. On anything with four or more trades and an inspection schedule, it is what keeps a three-month project from becoming a nine-month one.
Land inside the urban growth boundary is not getting cheaper, so more Hillsboro owners are building up or out instead of moving. Common projects: bumping out a primary suite, finishing space over the garage, converting a garage or building a detached ADU, and reworking a main floor for a multi-generational household. Each needs setback and lot coverage checked against zoning before a design is worth paying for.
Bids on the same project routinely vary by thirty percent, and it is almost never the same scope underneath. Line up allowances, exclusions, and who is carrying engineering and permit fees before you compare totals. Ask each GC how many jobs they run at once, who is the daily point of contact, and what the change-order process looks like. The answers tell you more about your next six months than the number does.
Every general contractor in Oregon must hold an active CCB registration, and the state's database shows license status, bond, insurance, and any complaint history. Check it yourself rather than taking a number off a truck door. Ask for a certificate of insurance sent directly from the agent, and never pay a large deposit up front — payment tied to milestones protects both sides.
Describe the project once and we match it with vetted local pros who actually do this work — you choose who to hire, or nobody at all.
Before design money is spent, the City of Hillsboro's zoning rules determine what is even possible on your lot: setbacks, lot coverage, height, and whether an ADU fits. Properties outside city limits answer to Washington County instead, with different standards and a different counter. Experienced local GCs check this at the first site visit, which is one useful way to tell them from someone new to the area.
Oregon's seismic provisions mean that removing bearing walls, cutting new large openings, or adding a second story usually requires stamped calculations from a licensed engineer. That is a real line item, commonly a few thousand dollars, and it happens before permit submittal rather than during construction. A bid that omits engineering on a structural project is not a complete bid.
Anything that opens a roof or a wall wants the dry stretch from June through September, and crews book that window months ahead. Interior-only projects run fine year-round. Plan review adds weeks on top, so a summer construction start realistically means starting design and permitting in late winter.
General contractors here typically carry overhead and profit of roughly fifteen to twenty-five percent of project cost, either built into a fixed price or stated openly on a cost-plus contract. As rough local benchmarks: a room addition commonly runs $350 to $550 per square foot finished; a detached ADU generally lands between $250,000 and $400,000 once site work and utilities are counted; a whole-house cosmetic renovation often falls between $100,000 and $250,000. Design, engineering, and permit fees usually add five to twelve percent. A bid dramatically under the others is a scope gap, not a discount — find the missing line before you celebrate.
We added a primary suite over the garage. Their GC handled engineering and the city plan review and gave us a weekly update every Friday without fail.
Three bids ranged by nearly seventy thousand. Comparing the exclusions side by side showed exactly why, and the middle bid turned out to be the complete one.
We wanted an ADU, and the first thing the GC did was check our zoning and lot coverage before we spent a dollar on drawings. It came back smaller than we had hoped, but it was buildable and it got built on schedule.
Once the job involves more than two or three trades, requires a permit with staged inspections, or has any structural element. Self-managing a bathroom is realistic for a patient owner. Self-managing an addition means being available on site daily for months.
Search the Construction Contractors Board's public database by business name or CCB number. It shows whether the registration is active, whether the bond and insurance are current, and any complaint history. Do this for every bidder before you take a meeting seriously.
Fixed price puts the risk on the contractor and works well when the scope is fully defined. Cost-plus with a stated fee is more honest for projects with unknowns, like opening up an older house, but it needs a not-to-exceed number and receipts you can actually review.
Simple over-the-counter work can move quickly, but anything requiring plan review commonly takes several weeks to a couple of months depending on workload and how complete the submittal is. Build that into your timeline rather than assuming construction starts the week you sign.
A modest deposit, then payments tied to completed milestones — permit issued, framing inspected, drywall complete, substantial completion — with a final retainage released after the punch list is done. Be very cautious about paying a large share of the total before work begins.
Describe the project, the rough budget, and your timing. Licensed general contractors serving Hillsboro will respond with their approach and availability at no cost to you.
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